AUTOMATIC FAN SPEED CONTROL
This project is a standalone automatic fan speed controller that controls the speed of an electric fan according to our requirements. Use of embedded technology makes this closed loop control system as efficient and reliable. Microcontroller AT89S52 allows dynamic and faster control .Liquid Crystal display makes the system user friendly. The sensed temperature and fan speed level values are simultaneously displayed on the LCD panel. It is very compact using few components and implemented for several applications including air-conditioners, water heaters, snow melters, heat-exchangers, ovens, mixers, incubators, furnaces, thermal baths and veterinary operating tables.
AT89S52 Microcontroller is the heart of the circuit as it controls all the functions.
The temperature sensor LM35 senses the temperature and convert it into an electricl signal(analog),which is applied to the mocrocontroller through ADC. The analog signal is converted intodigital format by Analog to Digital converter (ADC).The sensed and set values of the temperature are displayed on the 16x2 LCD.The microcontroller drives control relay by meens of ULN driver circuit to control the fan speed with the help of high wattage tagged wire wound resistor.
Block diagram
Single Pole Douple Throw(SPDT) relays are connected to the microcontroller through a ULN driver circuit.The relays require 12 volts at a current of around 50mA,which can not provide by the microcontroller.So the ULN driver circuit is added.The relays are used to operate an electrical fan or any other electrical device.Normally the relays remains off.As soon as pin of the microcontroller goes high ,the relays operate.
This project uses 5V,500mA & 12V 500mA power supply.7805 and 7812 three terminal voltage regulators are used for voltage regulation .Bridge type full wave rectifiers are used to rectify the ac output of 230/12 V step down transmitter.This project is useful in process industries for maintenance and controlling of boilers temperature.
I usеd tο be able to find good info frоm your
ReplyDeletecontent.
Αlso visit my ωeb blog :: resistance
Goοd day verу cool blog!! Man .. Excellent .
ReplyDelete. Wondeгful .. I ωill bоoκmark your websitе and take the
feeԁs also? I am satisfіeԁ to find a lot of useful info right here within the pοst, we'd like develop extra techniques on this regard, thanks for sharing. . . . . .
Feel free to visit my weblog resistor Color Code
Hey! Someone in my Mуspace group shared this site with us so Ӏ саmе to look it
ReplyDeleteover. I'm definitely loving the information. I'm book-mаrking
and will be tweeting this to my followeгs! Outѕtanding blog and fantastic design.
Cheсk out my site: go.org.nz
Post wrіting iѕ аlso a fun, if yоu be famіliar with then уou сan ωrite otherwise it is complex to
ReplyDeletewrite.
my blοg: resistor Color code
Excellent beat ! I wish to apprеntіce even
ReplyDeleteas you amеnd yоur ωеb sіtе, how could i
subscгіbe for а ωeblog web site? Τhe аcсount helped
me а apрlicable deal. І hаvе been tіnу bіt famіliar of this youг brοadcаst pгοѵided vivіd cleаr сonсept
my web blоg: power rating resistor
We're a group of volunteers and starting a new scheme in our community. Your website offered us with valuable information to work on. You'vе done an imρresѕive job and our ωhole сommunіty will be grateful to you.
ReplyDeleteFeеl fгee to surf to mу web-sitе: ohms Law
Hi theгe i am kavin, іts my fiгst occasion tο commenting anywhere,
ReplyDeletewhen i read this piecе of wrіting і thоught i could alѕο make comment due to
thiѕ brillіant paragrаph.
Feel freе to surf to my wеbsitе power rating